Theory of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ Cross-Whisker Josephson Junctions

Details Theory of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ Cross-Whisker Josephson Junctions Theory of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ Cross-Whisker Josephson Junctions

2002-11-20

arxiv.org/abs/cond-mat/0211423v2

Phys. Rev. B {\bf 67}, 174509 (2003).

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.67.174509

Takano {\it et al.} [Phys. Rev. B {\bf 65}, 140513 (2002) and unpublished] made Josephson junctions from single crystal whiskers of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ crossed an angle $\phi_0$ about the $c$ axis. From the mesa structures that formed at the cross-whisker interface, they inferred a critical current density $J_c(\phi_0)$. Like the single crystal results of Li {\it et al.} [Phys. Rev. Lett. {\bf 83}, 4160 (1999)], we show that the whisker data are unlikely to result from a predominantly d-wave order parameter. However, unlike the single crystals, these results, if correct, require the whisker c-axis transport to be coherent.

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